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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c55ebbef1748c97d54ae3478cbce9b2c4f91046f453564c90dc0d1bf4979d6' 
  AND token = 'XeOu5/lGkicnKsBq0mP1eI4KCZmBBCg6lnHDivs5dus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}